Subversion Repositories am9080_cpu_based_on_microcoded_am29xx_bit-slices

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-- Company: 

-- Engineer: 

-- 

-- Create Date: 09/24/2017 10:11:13 AM

-- Design Name: 

-- Module Name: Am25LS257 - Behavioral

-- Project Name: 

-- Target Devices: 

-- Tool Versions: 

-- Description: 

-- 

-- Dependencies: 

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-- Revision:

-- Revision 0.01 - File Created

-- Additional Comments:

-- 

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library IEEE;

use IEEE.STD_LOGIC_1164.ALL;

-- Uncomment the following library declaration if using

-- arithmetic functions with Signed or Unsigned values

--use IEEE.NUMERIC_STD.ALL;

-- Uncomment the following library declaration if instantiating

-- any Xilinx leaf cells in this code.

--library UNISIM;

--use UNISIM.VComponents.all;

entity Am25LS257 is

    Port ( a : in STD_LOGIC_VECTOR (3 downto 0);

           b : in STD_LOGIC_VECTOR (3 downto 0);

           s : in STD_LOGIC;

           nOE : in STD_LOGIC;

           y : out STD_LOGIC_VECTOR (3 downto 0));

end Am25LS257;

architecture Behavioral of Am25LS257 is

signal y_internal: std_logic_vector(3 downto 0);

begin

y_internal <= a when (s = '0') else b;

y <= y_internal when (nOE = '0') else "ZZZZ";

end Behavioral;